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   Message 142,633 of 143,326   
   Martin Brown to Stefan Ram   
   Re: energy and mass   
   10 Feb 26 21:36:59   
   
   XPost: sci.physics   
   From: '''newspam'''@nonad.co.uk   
      
   On 10/02/2026 20:32, Stefan Ram wrote:   
   > Phil Hobbs  wrote or quoted:   
      
   >> Doesn’t work though—the energy has mass too.   
   >   
   >    Energy does not always have mass. Counterexample:   
   >    A photon - it has energy, but no mass.   
      
   A photon has no *rest mass* - which not quite the same thing.   
      
   --   
   Martin Brown   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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